592 



INDEX 



Heteronomous segmenta- 

 tion, 126 



Heteropleuron, 441 



Heteropoda, 334 



Heteroptera, 428 



Heterosyllis, 275 



Heterotricha, 196 



Heterozygote, 138 



Hexacoralla, 230 



Hexactinellida?, 205 



Hexanchus, 506 



Hexapoda, 403 



Hind brain, 468 



Hind-gut, 94 



Hinge ligament, 318 



Hipparion, 569 



Hippasteria, 298 



Hippidas, 381 



Hippocampus, 511 



Hippolyte, 380 



Hippopotamus, 568 



Hippospongia, 205 



Hirundo, 544 



Hirudo, 284 



Hirudinei, 281 



Histology, 63 



Holoblastic, 142 



Holocephali, 507 



Holocystites, 303 



Holometabolous, 415 



Holostei, 508 



Holostome, 327 



Holothuria, 308 



Holothurioidea, 306 



Holotricha, 195 



Homarus, 380 



Homaxial animals, 123 



Homo, 574 



Homocercal, 32, 498 



Homodont, 553 



Homogeneous connective 

 tissue, 75 



Homology, 10, 90 



Homonomous segmenta- 

 tion, 126 



Homoptera, 428 



Homothermal, 104 



Homozygote, 138 



Hoofs, 450, 545 



Hookworm, 267 



Hopworm, 433 



Hormones, no 



Hormophora, 233, 235 



Horn bills, 544. 



Horned toads, 529 



Hornera, 287 

 Horntails, 425 

 Horns of cord, 468 

 Horse, 568 



ancestry of, 569 



flies, 430 



sponge, 205 

 House flies, 431 

 Humerus, 465 

 Humming birds, 544 

 Hyaena, 565 

 Hyaleida, 335 

 Hyaline cartilage, 77 

 Hyalonema, 204 

 Hyalospongia, 204 

 Hyas, 382 

 Hybrids, 21 



fertility of, 22 

 Hydrophyton, 427 

 Hydra, 129, 208, 217 

 Hydrachna, 397 

 Hydractinia, 217 

 Hydranth, 209 

 Hydraria, 216, 217 

 Hydrobatidse, 428 

 Hydrocaulus, 209 

 Hydrochoerus, 566 

 Hydroccele system, 294 

 Hydrocorallina?, 217 

 Hydrocores, 428 

 Hydroid, 209 

 Hydroides, 278 

 Hydromedusae, 208 

 Hydrophidffi, 531 

 Hydrophilidae, 424 

 Hydrophobia, 191 

 Hydropolyp, 207 

 Hydro psyche, 422 

 Hydrorhiza, 209 

 Hyclrotheca, 209 

 Hydrozoa, 208 

 Hyla, 520 

 Hylobates, 574 

 Hylodes, 519 

 Hymenolepis, 254 

 Hymenoptera, 424 

 Hyocrinus, 300 

 Hyoid arch, 460 

 Hyomandibular, 460 

 Hypaena, 433 

 Hypaxial muscles, 454 

 Hyperia, 384 

 Hyperina, 384 

 Hyperoartia, 492 

 Hyperotretia, 492 



Hypoblast, 146 

 Hypobranchial groove, 440 

 Hypoderma, 431 

 Hypodermis, 350 

 Hypogeophis, 519 

 Hypoglossal nerve, 471 

 Hypopharynx, 405 

 Hypophysis, 470 

 Hyporachis, 534 

 Hypotricha, 197 

 Hyracoidea, 570 

 Hyracotherium, 569 

 Hyrax, 570 

 Hystrix, 566 

 Hystricomorphia, 566 



Ibis, 544 



Ichneumonidae, 426 

 Ichneumons, 565 

 Icterus, 544 

 Ichthydium, 260 

 Ichthyobdella, 284 

 Ichthyodolurites, 505 

 Ichthyophis, 519 

 Ichthyopsida, 491 

 Ichthyornis, 541 

 Ichthyosauria, 526 

 Ichthyotomi, 507 

 Idioplasm, 137 

 Idiothermal, 104 

 Idotea, 386 

 Iguanidas, 529 

 Ilium, 464 

 Imaginal discs, 417 

 Imago, 414 

 Impennes, 543 

 Imperforata, 179 

 Incus, 461 



Indirect development, 150 

 Inermes, 281 

 Infrabasal, 300 

 Infraorbital ring, 497 

 Infundibula, 482, 555 

 Infunclibulum, 470 

 Ingluvies, 94, 408 

 Inheritance, Mendelian, 



138 



Inia, 571 

 Inquilines, 425 

 Insecta, 400 

 Insectivora, 564 

 Integripalliata, 324 

 Interambulacral plates, 296 

 Intercalaria, 453, 495 

 Intercellular substance, 74 



